A 3D buckling delamination problem for a simply supported rectangular orthotropic composite thick plate containing a rectangular crack and subjected to an axial compressive force is studied. In the initial state, crack faces have an infinitesimal imperfection. The development of this imperfection caused by an external compressive loading along the crack is investigated within the framework of the 3D geometrically nonlinear elasticity theory of anisotropic bodies. The corresponding boundary-value problems are solved numerically by the 3D FEM. The influence of material and geometrical parameters of the plate on its critical buckling force is evaluated and discussed.

中文翻译：

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内嵌矩形裂纹矩形各向异性厚板在轴向压缩作用下的屈曲分层

研究了包含矩形裂纹并受到轴向压缩力的简支矩形正交各向异性复合厚板的 3D 屈曲分层问题。在初始状态，裂纹面具有无穷小的缺陷。在各向异性体的 3D 几何非线性弹性理论的框架内研究了由沿裂纹的外部压缩载荷引起的这种缺陷的发展。相应的边界值问题通过 3D FEM 进行数值求解。评估和讨论了板的材料和几何参数对其临界屈曲力的影响。